6.4　Hearth Layer Surge Bin and Mixing Bin

6.4.1　Welding quality shall meet requirements of design technical document；if not required in design technical document，it must meet requirements ofⅣclass weld seam quality in current national standard GB 50236 Code for Construction and Acceptance of Field Equipment and Industrial Pipe Welding Engineering.

6.4.2　For bedding trough and mixed trough，pressure sensor between foundation and supporting seat should be substituted by temporary steel cushion until installation of trough is finished，which shall not be installed directly on the pressure sensor.

6.4.3　Bedding trough shall be installed as follows:

1　Elevation of trunnion bearing of trough shall be adjusted and checked by level and steel ruler，with tolerance of 1.0mm for height differential between two bearing bases.The longitudinal and transversal centerline of trunnion bearing shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 1.0mm；

2　The longitudinal centerline of bedding trough shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 3.0mm；

3　The transversal centerline of bedding trough shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 3.0mm；

4　Gap between lower material outlet and top surface of trolley grate shall be adjusted and checked by ruler with tolerance of±5.0mm；

5　The elevation of trunnion bearing of clamshell door shall be adjusted and checked by level and steel ruler with tolerance of 0.5mm.The longitudinal and transversal centerline of trunnion bearing shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 1.0mm；

6　The elevation of trunnion bearing of discharging trough shall be adjusted and checked by level and steel ruler with tolerance of 0.5mm.The longitudinal and transversal centerline of trunnion bearing shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 1.0mm.

6.4.4　The mixed trough shall be installed as follows:

1　The longitudinal centerline of mixed trough shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 3.0mm；

2　The transversal centerline of mixed trough shall be adjusted and checked by wire/thread，thread pendant and steel ruler with tolerance of 3.0mm；

3　The gap between discharging outlet and top surface of grate of trolley shall be adjusted and checked by ruler with tolerance of±3.0mm；

4　The radial displacement between discharging outlet and centerline of shaft of cylinder feeder shall be adjusted，and checked by ruler，with tolerance as specified in the design technical document.